Applicable Systems
EFC
FEX
FEI
HNC
Symptoms
The drive reports F8014 during auto compensation. An overcurrent condition was detected during the auto-tuning procedure. This may indicate a short circuit in the motor windings or cables during the measurement phase.
Possible Causes
- Encoder cable shielding damage causing signal interference
- Encoder internal component failure (optical disc contamination, photosensor aging, chip damage)
- Drive power module IGBT aging causing false current detection
- Incorrect encoder type or parameter settings in the drive configuration
- Insufficient cooling or blocked airflow causing thermal trip
Troubleshooting Steps
- Step 1: Inspect encoder cable for physical damage, check shielding continuity and grounding
Cable intact, shielding properly grounded at both ends - Step 2: Use oscilloscope to measure encoder feedback signal waveforms (A/B phases should be clean square waves with 90 degree phase offset)
Clean square wave signals with correct phase relationship - Step 3: Check drive encoder type setting matches actual encoder (incremental vs absolute)
Encoder type parameter matches the physical encoder - Step 4: For thermal faults (E2074): clean heatsink, check fan operation, measure three-phase current balance
Fan operational, heatsink clean, current balance within 5% - Step 5: If signal issues persist after cable and parameter checks, replace encoder or drive module
Fault clears after component replacement
How to Reset
To reset: 1) Fix the root cause (encoder cable, signal interference, cooling, or parameter error). 2) Clear the fault via HMI or parameter interface. 3) Restart the drive. For auto-compensation faults (F8010-F8016), re-run the auto-tuning procedure after fixing the issue. Caution: Repeated trips without fixing the root cause will permanently damage drive components.
Frequently Asked Questions
- Q: What causes Rexroth drive fault F8014?
Auto Compensation: Overcurrent. The drive reports F8014 during auto compensation. An overcurrent condition was detected during the auto-tuning procedure. This may indicate a short circuit in the motor windings or cables during the measurement phase.
- Q: How do I test the encoder signal on a Rexroth drive?
Use an oscilloscope to measure the encoder feedback signals. For incremental encoders, A and B phases should show clean square waves with 90 degree phase offset, and frequency should vary with motor speed. For absolute encoders, check the battery voltage and serial communication signal.
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Source: Bosch Rexroth IndraDrive Manual; baijiahao.baidu.com (Rexroth servo drive fault codes); szsfwx.com; 11467.com; chem17.com; oil-gift.com
Category: PLC & VFD
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